Manganese-base vanadium-containing MnAlV alloy smelted by high-phosphorus manganese ores and smelting method thereof

Abstract

The invention relates to a manganese-base vanadium-containing MnAlV alloy smelted by high-phosphorus manganese ores and a smelting method thereof. The MnAlV alloy comprises the following chemical components by mass percentage: 30%-50% of Mn, 20%-40% of Al, 10%-20% of Si, 1%-10% of V, not more than 0.08% of P and the balance of Fe and other impurity elements. The needed main raw materials for smelting the alloy comprise the high-phosphorus manganese ores, manganese-enriched residues, coke, blue coke, silica, ferrovanadium, pure aluminum as well as a corresponding dephosphorizing agent and a slag forming constituent. The smelting method comprises the following steps: according to the design requirements for alloy components, firstly weighing the needed raw materials based on per unit weightof alloy; smelting the raw materials into a silicon-manganese alloy mother liquid; dephosphorizing, alloying and casting; and finally cooling to obtain the MnAlV alloy. The manganese-base vanadium-containing MnAlV alloy smelted by the method has high aluminum content, high vanadium content and low phosphorus content; the alloy can be stored under various weather conditions and has a stale structure without chalking; and a crystal structure and a carbide shape of the alloy are improved so as to enhance steel performances such as yield strength, tensile strength, heat resistance and cold workability.

Description

technical field [0001] The invention relates to smelting manganese-based vanadium-containing MnAlV alloy with high-phosphorus manganese ore and a preparation method thereof. The alloy can be used for deoxidation and alloying of molten steel such as low-temperature steel, wear-resistant steel, heavy rail steel, oil pipeline, and automobile steel. Background technique [0002] Against the background of the global economic weakness and rising iron ore prices since 2008, my country's iron and steel industry is facing multiple pressures such as rising costs and slowing demand. Due to backward production capacity and other measures, iron and steel enterprises have begun to focus on low-carbon, low energy consumption, and high value-added production. At the same time, my country's manganese ore has low grade and high energy consumption. It is controlled by others in the international market, and industrial innovation is urgently needed. [0003] In recent years, with the rapid deve...

AI Technical Summary

Problems solved by technology

However, a series of problems such as the low yield of aluminum element in the preparation process of aluminum-vanadium master alloy and the easy aging pulverization of the alloy during storage seriously restrict the industrial application of this type of alloy.

Most of the invention patents published in recent years only focus on adding various alloying elements to the aluminum-vanadium master alloy. For example, the aluminum-vanadium master alloys published in Chinese patents CN1629332A and CN101195887 have added other alloying elements except vanadium. The vanadium content As high as 40% or more, but these two patents use single aluminum as a deoxidizing element, which greatly reduces the deoxidizing effect of the alloy. At the same time, because vanadium also has a good deoxidizing ability, when the aluminum content When it is low, the oxygen atoms in molten steel that fail to react with aluminum will consume alloying elements such as vanadium, which will inevitably cause waste of precious metals such as vanadium, which is not conducive to the effective utilization of resources

Chinese patent CN1548562A discloses a rare earth aluminum-manganese-vanadium-iron alloy and its preparation method. Its aluminum content reaches 50% to 60%, and manganese and rare earth elements are added at the same time. The combined action of manganese and vanadium can improve the strength and wear resistance of steel. , reducing the low temperature critical temperature of steel can also improve the deoxidation ability of a single aluminum element, the inclusions after deoxidation are easy to aggregate and grow, and the addition of rare earth elements also makes the alloying effect better; but the main alloying element vanadium content is less than 5%, The manganese content is also lower than 15%, and the addition of manganese elements can easily lead to the problem of aging powdering of the alloy has not been solved; the aluminum content is high, and the appropriate size of the aluminum ingot and the time of entering the furnace are not considered when adding a large amount of aluminum ingots, which will cause The melting time of aluminum is too long, and the aluminum is in a high temperature environment for a long time after melting, resulting in serious burning of aluminum and low yield of aluminum

Images